Biology- Unit 2

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  • Created by: xxSonia
  • Created on: 14-04-14 15:51
Function of the Nucleus
Contains the genetic material that controls the activities of the cell
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Cell membranes
Controls what goes in and out
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Where chemical reactions can take place
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Where proteins are made in the cell
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Contains cell sap
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Where photosynthesis occurs, too make food for the plant. Contains a green substance called chlorophyll
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Where respiration occurs. Releases the energy needs for cell to work
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Yeast cell
Microorganism,has a nucleus,cytoplasm and cell membrane surrounded by a cell wall.
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Bacteria Cell
Single celled microorganism, a bacterial cell has cytoplasm and cell membrane surrounded by a cell wall. Has no nucleus instead genetic material floating in cytoplasm
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The spreading out of particles from an area of HIGH CONCENTRATION to an area of LOW CONCENTRATION
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The bigger the difference in concentration...
The faster the diffusion rate
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Cell Membranes...
Only small molecules can diffuse through cell membranes e.g oxygen,water, amino acids and water. Big moleculesN
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Palisade cells are adapted for photosynthesis by...
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Guard Cells are adapted to open and close pores by...
Kidney shape,turgid,flaccid,thin and thickened inner walls, sensitive to light and close at night
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Red blood cells are adapted to carry oxygen by...
Concave shape,hemoglobin , no nucleus
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Egg cells are specialised for reproduction by...
is to carry female DNA and nourish embryo therefore contains huge food reserves. When sperm fuses with the egg, The egg's membrane instantly changes its structure by stopping any more sperm getting in , ensures offspring has correct amount of DNA
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Sperm cells are specialised for reproduction by...
Carry male DNA to female DNA. Long tail and straemlined head to help it to swim. Lots of mitochondria to provide cell energy. Enzymes in the heads to digest through egg cell membrane
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What is Differentiaton
The process off which cells become specialised allowing them to carry out a particular function
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Muscular tissue
moves stomach walls to churn up the food in the stomach
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Glandular tissue
makes the digestive juices to digest the food in the stomach
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Epithelial tissue
which covers the outside and inside of the stomach
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e.g the pancreas and salivary glands - produces digestive juices
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The stomach and small intestine
digest the food
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produces bile
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Small intestine
absorbs soluble food molecules
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Large intestine
absorbs water from undigested food, leaving feaces
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Cell membranes


Controls what goes in and out

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